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- Multiple ChoicePlease save your changes before editing any questions.Which of the following is a chemical change?Iron rustingGlass breakingClothing rippingHair cut
- Multiple ChoicePlease save your changes before editing any questions.
Is this equation balanced?YesNoNot enough information - Multiple ChoicePlease save your changes before editing any questions.What is the law of conservation of matter?Matter changes when reacted or changed.The mass of all reactants are changed during a physical or chemical change.The mass of the reactants is the same as the mass of the products.The mass of the products is different than the mass of the reactants.
- Multiple ChoicePlease save your changes before editing any questions.Which of the following is evidence of a chemical change?Change in stateNo new substance is formedBubbles formingChange in shape
- Multiple ChoicePlease save your changes before editing any questions.Which of the following is an example of a physical change, and why?Fire burns in fireplace, because a new substance is formed.Clothes are folded, because there is a color change.A mirror is broken, because there is a change in shape/size.cookies are baked, because there is a change in temperature
- Multiple ChoicePlease save your changes before editing any questions.This number is used to represent the number of each atom being represented. What is the name of this number?An ExponentThe CoefficientA MoleculeThe Subscript
- Multiple ChoicePlease save your changes before editing any questions.This appears on the left side of a chemical formula, and represents how many compounds there are. What is the name of this number?A Dangling ParticipleThe SubscriptA Prime NumberThe Coefficient
- Multiple ChoicePlease save your changes before editing any questions.How many hydrogen atoms are in this chemical formula:4 hydrogen atoms1 hydrogen atom2 hydrogen atoms3 hydrogen atoms
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The atomic number of oxygen is
8
15.9994
16
O
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Identify the elements in this compound.
Carbon, Helium, Oxygen
Chromium, Hydrogen, Oxygen
Calcium, Hydrogen, Oxygen
Carbon, Hydrogen, Oxygen
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The number of electrons in a Lithium atom is
3
4
6
7
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The opposite phase of melting is
Condensation
Vaporization
Sublimation
Freezing
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Electrons are
Positively charged particles
Negatively charged particles
Neutral
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If an atom has 3 electrons, how many protons does it have?
1
2
3
4
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A group of elements that are shiny, conduct heat and electricity well is called
Metals
Non-metals
Metalloids
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What is made up two or more elements that are chemically combined?
Atom
Element
Compound
Mixture
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Which of these is a property of metals?
Malleable
Very brittle
Can't conduct electricity
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What does the nucleus of an atom contain?
Electrons and neutrons
Protons and neutrons
Electrons and protons
DNA
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Which is an example of an heterogenous mixture?
soy sauce
salad
tea
guacamole
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Metals are located on what size of the periodic table?
left
right
the stairway
the bottom